On July 7, 2017, the U.S. Court of Appeals for the District of Columbia Circuit (“D.C. Circuit” or the “Court”) issued a decision invalidating two key elements of the regulatory definition of solid waste under the Resource Conservation and Recovery Act (“RCRA”), as amended by the U.S. Environmental Protection Agency (“EPA” or the “Agency”) in 2015, and rejecting efforts to impose additional conditions on existing exclusions in the hazardous waste program.